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Accumulated Other Comprehensive Income (Loss) - Changes in Balances of Each Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 1,777,960	$ 1,455,848	$ 1,786,437	$ 1,408,260
Other comprehensive income before reclassifications			41,756	38,268
Amounts reclassified from accumulated other comprehensive income	(2,242)	(1,390)	(5,785)	(2,244)
Total other comprehensive income (loss), net of tax			35,971	36,024
Ending balance	1,809,095	1,501,636	1,809,095	1,501,636
Total
Accumulated Other Comprehensive Income (Loss)
Beginning balance	53,656	(1,595)	27,874	(21,422)
Ending balance	63,845	14,602	63,845	14,602
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Beginning balance			38,872	(6,343)
Other comprehensive income before reclassifications			42,909	39,130
Amounts reclassified from accumulated other comprehensive income			(6,067)	(2,357)
Total other comprehensive income (loss), net of tax			36,842	36,773
Ending balance	75,714	30,430	75,714	30,430
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Beginning balance			(1,141)	(559)
Other comprehensive income before reclassifications			(1,153)	(862)
Amounts reclassified from accumulated other comprehensive income			282	113
Total other comprehensive income (loss), net of tax			(871)	(749)
Ending balance	(2,012)	(1,308)	(2,012)	(1,308)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Beginning balance			(9,857)	(14,520)
Other comprehensive income before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive income			0	0
Total other comprehensive income (loss), net of tax			0	0
Ending balance	$ (9,857)	$ (14,520)	$ (9,857)	$ (14,520)

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